This invention relates to a protected organotin-based catalyst system for polyurethane synthesis that is useful in coatings applications. The catalyst has low activity in the absence of oxygen. When a coating mixture comprising the catalyst is sprayed and/or applied to a substrate as a thin film in air, the catalyst is activated. For solvent-based refinish systems comprising hydroxyl and isocyanate species at high solids levels, the catalyst system therefore provides extended viscosity stability, i.e., pot life.
本发明涉及一种受保护的
有机锡催化剂体系,用于聚
氨酯合成,适用于涂层应用。该催化剂在无氧情况下活性较低。当将包含催化剂的涂层混合物喷涂和/或涂抹到基底上作为薄膜时,催化剂被激活。对于高固体含量的羟基和
异氰酸酯物质的溶剂基再涂系统,该催化剂体系因此提供了延长的粘度稳定性,即潜伏期。